Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1293963 | Journal of Power Sources | 2010 | 5 Pages |
Abstract
Electrochemical oxidation of l-ascorbic acid on polycrystalline silver in alkaline aqueous solutions is studied by cyclic voltammetry (CV), chronoamperometry (CA) and impedance spectroscopy (IS). The anodic electro-oxidation starts at â500 mV versus SCE and shows continued anodic oxidation in the cathodic half cycle in the CV regime signifying slowly oxidizing adsorbates. Diffusion coefficient of ascorbate ion measured under both voltammetric regimes is around 1.4 Ã 10â5 cm2 sâ1. Impedance spectroscopy measures the capacitances associated with double layer and adsorption around 50 μF cmâ2 and 4 mF cmâ2 as well as the adsorption and decomposition resistances (rates).
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
L. Majari Kasmaee, F. Gobal,